如何在 iOS 中播放循环视频？

Posted 2023-02-23

【中文标题】如何在 iOS 中播放循环视频？

【英文标题】：How to play a looping video in iOS?

【发布时间】：2016-09-09 16:21:02

【问题描述】：

如何将视频剪辑放入我的故事板？我看到的是：

另外，我应该把 .mp4 文件放在哪里？

最后，当 View Controller 启动时，循环视频剪辑包含的正确代码是什么。

 //insert looping video clip here

我熟悉 android Studio/java 并且可以毫无问题地做到这一点。但是，我对 swift 和 Xcode 很陌生，所以我遇到了麻烦。

【参考方案1】：

制作循环视频：-

将UIView 添加到您的 ViewController，相应地设置约束。

在符合要求的类中将 UIView 声明为 @IBOutlet

    @IBOutlet weak var videoView : VideoPlay!
    //Where VideoPlay is a CustomClass for the Video player

为视频播放器UIVew 创建一个自定义类：VideoPlay

import UIKit
import AVFoundation



class VideoPlay: UIView 

     private var player : AVPlayer!

      private var playerLayer : AVPlayerLayer!

    init() 

             super.init(frame: CGRectZero)
              self.initializePlayerLayer()

          

          override init(frame: CGRect) 
              super.init(frame: frame)
              self.initializePlayerLayer()
              self.autoresizesSubviews = false
          

          required init?(coder aDecoder: NSCoder) 
              super.init(coder: aDecoder)
              self.initializePlayerLayer()

          


          private func initializePlayerLayer() 

              playerLayer = AVPlayerLayer()
              playerLayer.backgroundColor = UIColor.whiteColor().CGColor
              playerLayer.videoGravity = AVLayerVideoGravityResizeAspectFill

              self.layer.addSublayer(playerLayer)
              playerLayer.frame = self.bounds
          

          func playVideoWithURL(url: NSURL) 

              player = AVPlayer(URL: url)
              player.muted = false

              playerLayer.player = player

              player.play()

              loopVideo(player)
          

          func toggleMute() 
              player.muted = !player.muted
          

          func isMuted() -> Bool
          
                        return player.muted
          

          func loopVideo(videoPlayer: AVPlayer) 

              NSNotificationCenter.defaultCenter().addObserverForName(AVPlayerItemDidPlayToEndTimeNotification, object: nil, queue: nil)  notification in

                  videoPlayer.seekToTime(kCMTimeZero)
                  videoPlayer.play()
              
          

      

修改您的 StoryBoard 符合 ViewController :-

   class ViewController: UIViewController         

       @IBOutlet weak var videoView : VideoPlay!  

       override func viewDidLoad() 
               super.viewDidLoad()
                       let bundle: NSBundle = NSBundle.mainBundle()
                       let moviePath: String = bundle.pathForResource("yourVideoFile_Name", ofType: "yourVideoFile_Type")!
                       let movieUrl : NSURL = NSURL.fileURLWithPath(moviePath)

                       videoView.playVideoWithURL(movieUrl)


           ....
     

由于videoView符合类VideoPlay，你可以访问 VideoPlay 的全局函数。

至于保存视频文件的位置，请将其保存在主包中，即：- 在您的情况下 Fighting Trainer Pro 文件夹

如：-

toggleMute()

isMuted()

【讨论】：

我需要将 mp4 文件放在任何地方吗？另外，我需要将任何东西拖到我的故事板上吗？

只是一个循环播放的视频片段，我不知道循环播放的背景视频/和循环播放的视频有什么区别。

绝对没有区别，但可以在 videoPlayer 上添加其他子视图，仅此而已......我已经更新了我的答案:)

在符合storyboard viewcontroller的viewController类的类函数viewDidLoad()中。我在回答中已经提到了...

Apple 在名为 Advances in AVFoundation Playback 的 WWDC 2016 会议期间提供了一些示例代码 (AVPlayerLooper)。他们讨论了使用 AVQueuePlayer 幻灯片 59：devstreaming.apple.com/videos/wwdc/2016/503lkp4vimgv7tqecn7/503/… 示例代码：developer.apple.com/library/prerelease/content/samplecode/…

循环播放视频的最佳方式

【参考方案2】：

Dravidian 答案的 Objective-C 版本。还包含关键的layoutSubviews 方法，使视频层实际上保持与视图相同的大小！

#import "LBVideoView.h"
#import <AVFoundation/AVFoundation.h>

@interface LBVideoView ()

    AVPlayer *_player;
    AVPlayerLayer *_playerLayer;

@end

@implementation LBVideoView
- (instancetype)initWithFrame:(CGRect)frame

    return [[super initWithFrame:frame] commonInit];

- (instancetype)initWithCoder:(NSCoder *)aDecoder

    return [[super initWithCoder:aDecoder] commonInit];


- (instancetype)commonInit

    _playerLayer = [AVPlayerLayer new];
    _playerLayer.backgroundColor = UIColor.clearColor.CGColor;
    _playerLayer.videoGravity = AVLayerVideoGravityResizeAspect;
    [self.layer addSublayer:_playerLayer];
    _playerLayer.frame = self.bounds;
    return self;


- (void)dealloc

    [[NSNotificationCenter defaultCenter] removeObserver:self];


- (void)playVideoWithURL:(NSURL*)url

    _player = [AVPlayer playerWithURL:url];
    _playerLayer.player = _player;
    [_player play];
    [self loopVideo];


- (void)loopVideo

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(movieEnded) name:AVPlayerItemDidPlayToEndTimeNotification object:nil];

- (void)movieEnded

    [_player seekToTime:kCMTimeZero];
    [_player play];


- (void)layoutSubviews

    [super layoutSubviews];
    _playerLayer.frame = self.bounds;


@end